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# Lorazepam (Benzodiazepine)
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, anticonvulsant, and muscle relaxant properties. It enhances the effect of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABA-A receptor, resulting in increased neuronal inhibition.
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Status epilepticus
* Preoperative sedation
* Management of alcohol withdrawal symptoms
## Adult Dosing
* **Anxiety:** 0.5-2 mg orally every 6-8 hours. Maximum daily dose generally 10 mg.
* **Insomnia:** 1-2 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously or intramuscularly, may repeat in 5-10 minutes if needed. Maximum 8 mg per dose.
* **Preoperative Sedation:** 2-4 mg intramuscularly 2 hours before surgery or 2-4 mg intravenously 15-20 minutes before surgery.
* **Alcohol Withdrawal:** 1-4 mg orally or intravenously every 4-6 hours as needed, based on symptom severity. Dosing is highly individualized.
## Pediatric Dosing
Dosing in pediatric patients is less established and should be determined by specific clinical indications and patient factors, often requiring dose titration.
* **Status Epilepticus:** 0.1 mg/kg IV/IM, maximum 4 mg per dose. May repeat once after 5-10 minutes if needed.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** Use with caution; dose reduction may be necessary.
* **Elderly:** Start with lower doses (e.g., 0.5 mg orally twice daily) and titrate cautiously due to increased sensitivity and risk of side effects.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea.
## Adverse Effects
Common: Drowsiness, dizziness, weakness, unsteadiness, confusion.
Less common: Paradoxical excitation, amnesia, gastrointestinal upset, visual disturbances, depression, respiratory depression (especially with IV administration or in combination with other CNS depressants). Long-term use can lead to physical and psychological dependence.
## Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives, antipsychotics, antihistamines):** Additive sedative and respiratory depressant effects. Exercise extreme caution and consider dose reduction of one or both agents.
* **Valproic acid:** May increase lorazepam levels by displacing it from protein binding sites.
* **Theophylline/Aminophylline:** May reduce the sedative effects of lorazepam.
## Monitoring
* Level of sedation and consciousness.
* Respiratory rate and oxygen saturation, especially with IV administration or in patients with respiratory compromise.
* Signs of dependence or withdrawal upon discontinuation.
* Mental status and mood changes.
## Clinical Pearls
* Intramuscular (IM) lorazepam is reliably absorbed. Intravenous (IV) administration is preferred for rapid effect, especially in status epilepticus, but carries a higher risk of respiratory depression.
* Avoid abrupt discontinuation after prolonged use to prevent withdrawal symptoms. Taper the dose gradually.
* Lorazepam is often considered a preferred benzodiazepine for IV administration due to its relatively predictable pharmacokinetics and lower risk of propylene glycol toxicity compared to diazepam.
* Use in pregnancy, especially in the third trimester, may cause "floppy infant syndrome" and withdrawal symptoms in the neonate.
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*Disclaimer: This information is intended for healthcare professionals and does not substitute for professional medical advice. Always consult the most current prescribing information and guidelines for definitive patient care decisions.*
